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[[File:Vol4 page 0242 eq 003.png|RTENOTITLE]]....................(3) | [[File:Vol4 page 0242 eq 003.png|RTENOTITLE]]....................(3) | ||
Clearly, a flow efficiency of 1 indicates an undamaged well with Δ''p''<sub>skin</sub> = 0, a flow efficiency > 1 indicates a stimulated well (perhaps because of a hydraulic fracture), and a flow efficiency < 1 indicates a damaged well. Note that, to determine flow efficiency, we must know the average reservoir pressure, [[File:PR.PNG|middle| | Clearly, a flow efficiency of 1 indicates an undamaged well with Δ''p''<sub>skin</sub> = 0, a flow efficiency > 1 indicates a stimulated well (perhaps because of a hydraulic fracture), and a flow efficiency < 1 indicates a damaged well. Note that, to determine flow efficiency, we must know the average reservoir pressure,[[File:PR.PNG|middle|25x25px|PR]], and skin factor, ''S''. Methods to measure these quantities are discussed in [[Determination_of_flow_efficiency_and_skin|Determination of flow efficiency and skin]]. | ||
The impact of skin on well productivity can be estimated by the use of [[Reservoir_inflow_performance|inflow performance relationships]] (IPRs) for the well such as those proposed by Vogel, <ref name="r3">Vogel, J.V. 1968. Inflow Performance Relationships for Solution-Gas Drive Wells. J Pet Technol 20 (1): 83-92. http://dx.doi.org/10.2118/1476-PA</ref> Fetkovich, <ref name="r4">Fetkovich, M.J. 1973. The Isochronal Testing of Oil Wells. Presented at the Fall Meeting of the Society of Petroleum Engineers of AIME, Las Vegas, Nevada, 30 September-3 October 1973. SPE-4529-MS. http://dx.doi.org/10.2118/4529-MS</ref> and Standing. <ref name="r2">Standing, M.B. 1970. Inflow Performance Relationships for Damaged Wells Producing by Solution-Gas Drive. J Pet Technol 22 (11): 1399-1400. SPE-3237-PA. http://dx.doi.org/10.2118/3237-PA</ref> These IPRs can be summarized as follows<ref name="r5">Peters, E.J. 1990. Class notes. Department of Production Engineering, University of Texas at Austin (1990)</ref>: | The impact of skin on well productivity can be estimated by the use of [[Reservoir_inflow_performance|inflow performance relationships]] (IPRs) for the well such as those proposed by Vogel, <ref name="r3">Vogel, J.V. 1968. Inflow Performance Relationships for Solution-Gas Drive Wells. J Pet Technol 20 (1): 83-92. http://dx.doi.org/10.2118/1476-PA</ref> Fetkovich, <ref name="r4">Fetkovich, M.J. 1973. The Isochronal Testing of Oil Wells. Presented at the Fall Meeting of the Society of Petroleum Engineers of AIME, Las Vegas, Nevada, 30 September-3 October 1973. SPE-4529-MS. http://dx.doi.org/10.2118/4529-MS</ref> and Standing. <ref name="r2">Standing, M.B. 1970. Inflow Performance Relationships for Damaged Wells Producing by Solution-Gas Drive. J Pet Technol 22 (11): 1399-1400. SPE-3237-PA. http://dx.doi.org/10.2118/3237-PA</ref> These IPRs can be summarized as follows<ref name="r5">Peters, E.J. 1990. Class notes. Department of Production Engineering, University of Texas at Austin (1990)</ref>: | ||
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